selffacedadj.天然表面的(未修整的)selfn.自己；本性；自我pron.我自己；你自己；他或她自己adj.始终如一的；同一类型的；性质不变的v.近亲繁殖；自花授粉self- mutilation behavior自我伤害行为self-synchronizing device自学方法self-relevant information自我相关信息self-reported delinquency自我报告少年犯罪self-testable failure set可自测故障集self-produced cold charge自产冷料self-synchronizing clutch自动同步离合器self registering thermomete自记温度计self demagnetization effect自去磁效应Self-adjusting Parameters参数自调整

1. We must put more effort into advertising.
   我们必须在广告上下更大的工夫。
2. This student seems to have spent too much effort on this piece of writing.
   这个学生似乎在这篇文章上花的工夫太大了。